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Title of Journal: OPT REV

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Abbravation: Optical Review

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Optical Society of Japan

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DOI

10.1007/s10639-014-9365-1

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1349-9432

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New collection systems for multi LED light engines

Authors: ShengHan Tu JuiWen Pan ChihMing Wang YeeuChang Lee JenqYang Chang
Publish Date: 2010/06/25
Volume: 16, Issue: 3, Pages: 318-322
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Abstract

Light emitting diodes LEDs have numerous advantages as light sources in projectors LEDs are more compact exhibit a larger color gamut have a longer lifetime and need a lower supply voltage However there is still one important disadvantage the optical power per unit of étendue luminance of an LED is significantly low As a result of the étendue limitations of LEDs the projected flux on the screen will not be high Despite this shortcoming LED’s are still of great interest for low power applications because of their other superior properties Thus we collect the available light flux optimally and combine multiple high luminance LEDs within the system In this study we discuss three collection systems designed to collect the LED flux with high optical efficiency while retaining small device size The best collection efficiency attained with our collection systems is 96 The fabrication tolerance and cost of our collection systems are also analyzed

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